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you have to delete your online account.you can do this by going to account settings and then going to memory go to call of duty 4,modern warfare then click on your gamertag next to your gamer tag will be online progress do not press campaign progress unless you feel like doing your single player over.then press delete you will have to make a new account online but atleast you will be able to play.
finding your Key Code For COD4
running Windows operating systems and playing COD4 to find your CD Key.
Click on “Start” then “Run” In the “Open” field enter “Regedit” and click on “OK”
Windows Registry Editor will open.
Expand in this order: “My Computer”, “HKEY_LOCAL_MACHINE”, “SOFTWARE”, “Activision”, and finally select “Call of Duty 4′
on the right side you will see “codkey”.
if you are using a wireless connection the signal may be to weak. if not you can try deleting your game and save data. you will lose any single player saves you will also have to re download any map packs you purchased. the game should also do an update when you load again after deleting the game and save.
It's the Call of Duty 4 Servers from uploading the Map Pack. Their are alot of players That have downloaded it recently, and it is lagging their Servers. If you just wait a little bit, the problem should be fixed and all set to go.
When you play online games it will usually require more system resources to power. Your processor also handles the data that is being sent and received during your online session. Some code for online games have more overhead than others. I do not believe that it has anything to do with your machine, but more the software and network overhead that the multiplayer game requires. If you notice that both single and multiplayer run on seperate executables...
Single Player = C:\Program Files\Activision\Call of Duty 4 - Modern Warfare\iw3sp.exe
Multiplayer = C:\Program Files\Activision\Call of Duty 4 - Modern Warfare\iw3mp.exe